//
//  Global.m
//  Gruphoto
//
//  Created by Thao Nguyen Huy on 1/3/13.
//  Copyright (c) 2013 CNC Software. All rights reserved.
//

#import "Global.h"

NSInteger whereEventCome = 0;
GPFacebookLoginType facebookLoginType = GPFacebookLoginTypeNone;

NSString *const GPFacebookSessionStateChangedNotification = @"com.cncmobile.gruphoto:GPFacebookSessionStateChangedNotification";
NSString *const GPFacebookSessionDidOpenedNotification = @"com.cncmobile.gruphoto:GPFacebookSessionDidOpenedNotification";
NSString *const GPFacebookSessionDidClosedNotification = @"com.cncmobile.gruphoto:GPFacebookSessionDidClosedNotification";
NSString *const GPFacebookSessionDidFailedNotification = @"com.cncmobile.gruphoto:GPFacebookSessionDidFailedNotification";

@implementation Global

+ (float)systemVersion {
    return [[[UIDevice currentDevice] systemVersion] floatValue];
}

+ (float)screenHeight {
    return [[UIScreen mainScreen] bounds].size.height;
}

+ (BOOL)isIphone5 {
    float height = [Global screenHeight];
    if (height == 568.0) {
        return YES;
    }
    return NO;
}

+ (BOOL)isValidEmail:(NSString *)email {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailPredicate evaluateWithObject:email];
}

+ (UIImage *)resizeImage:(UIImage *)image tosize:(CGSize)targetSize {
    UIImage *sourceImage = image;
    UIImage *newImage = nil;
    CGSize imageSize = sourceImage.size;
    CGFloat width = imageSize.width;
    CGFloat height = imageSize.height;
    CGFloat targetWidth = targetSize.width;
    CGFloat targetHeight = targetSize.height;
    CGFloat scaleFactor = 0.0;
    CGFloat scaledWidth = targetWidth;
    CGFloat scaledHeight = targetHeight;
    CGPoint thumbnailPoint = CGPointMake(0.0,0.0);
    if (CGSizeEqualToSize(imageSize, targetSize) == NO) {
        CGFloat widthFactor = targetWidth / width;
        CGFloat heightFactor = targetHeight / height;
        if (widthFactor > heightFactor) {
            scaleFactor = widthFactor; // scale to fit height
        }
        else {
            scaleFactor = heightFactor; // scale to fit width
        }
        
        scaledWidth  = width * scaleFactor;
        scaledHeight = height * scaleFactor;
        
        // center the image
        if (widthFactor > heightFactor) {
            thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
        }
        else {
            if (widthFactor < heightFactor) {
                thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
            }
        }
    }
    
    UIGraphicsBeginImageContext(targetSize); // this will crop
    
    CGRect thumbnailRect = CGRectZero;
    thumbnailRect.origin = thumbnailPoint;
    thumbnailRect.size.width  = scaledWidth;
    thumbnailRect.size.height = scaledHeight;
    
    [sourceImage drawInRect:thumbnailRect];
    
    newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    if (newImage == nil) {
        NSLog(@"could not scale image");
    }
    //pop the context to get back to the default
    UIGraphicsEndImageContext();
    return newImage;
}

@end
